Abstract: Substituted and non-substituted cyclodextrines are used as stabilizing agents for nanodispersions containing magnetic core particles M. The nanodispersions, which exhibit high saturation polarization with great biocompatibility, are suitable as transport vehicles for other pharmacologically and biologically active substances. The magnetic core particles of the nanodispersions are enveloped by compounds of the general formula (Ap, C, Bq), wherein A is reactive groups, B is bioactive groups and C is cyclodextrines.

Abstract: Modified aminoplast resin comprising:(a) 60 to 99.5% by weight of an aminoplast precondensate which has been etherified with a lower alkanol to an extent not exceeding 10% and(b) 0.5 to 40% by weight of a modifying agent which comprises a mixture of (i) a water-soluble polyester prepared from carboxylic acids with at least one carboxyl and dihydric or polyhydric alcohols, and (ii) sufficient free diol or polyol whereby the mixture has a ratio of the sum of free and esterified hydroxyls of 0.8 to 4.5 moles for each mole of the sum of free and esterified carboxyls which resins are useful in impregnating webs for producing laminates and panels of wood-based materials.